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Note 11 - Subsequent Events (Details Textual) - $ / shares |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 26, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Subsequent Event [Member] | Employee [Member] | Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 48 years |  |  |
Subsequent Event [Member] | Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 25,000 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 1.25 |  |  |
Subsequent Event [Member] | Former Consultant [Member] |  |  |  |
Class of Warrant or Right, Extension, Number of Warrants | 100,000 |  |  |
Class of Warrant or Right, Extension Period | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 1,974,445 | 490,000 | 240,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 1.25 | $ 1.25 | $ 1

X
- Definition The number of warrants, for which expiration date are extended. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The extended period of the warrants or rights that are exercisable. + References No definition available. + Details
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X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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X
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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